Ignition-arch for furnaces.



W. M. 11111101111. IGNITION ARCH FOR FURNACES.

APPLICATION FILED JULY 8, 1911.

Patented 061. 17,1911.

inventor: W.M.Du11oan fittest @NWW 5, 73. 5

ALFY s.

. edges of the beams and WILLIAM MILLEN DUNCAN, OF ALTON, ILLINOIS.

IGNITION-ARCH FOR FURNACES.

- Specification of Letters Patent.

Patented Oct. 1'7, 1911.

Application filed July 8, 1911. Serial No. 637,485.

To all whom it may concern:

Be it lmown that I, WILLIAM M. DUNCAN, a citizen of-the United States,residing in Alton, county of Madison, and State of Illinois, haveinvented certain new and useful Improvements in Ignition-Arches forFurnaces, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, forming apart of this specification.

My invention relates to an ignition arch for promoting the combustion offuel in furnaces, and it has for its objects the production of an archof this kind that is" of great simplicity, of inexpensive structure, andone in which the arch supporting members are not liable to becomeimpaired by heat during their service; while at the same time permittingthe replacement of impaired parts at a slight expenditure of cost andlabor when such parts become unfit for further service after longcontinued use.

Figure I is a view showing a partof a furnace and a mechanical stoker 1ndotted outline, and also showing a side elevation of one row of thetiles in my fire arch, and a cross section of the tile supports. Fig. IIis an enlarged vertical cross section taken on line IIII, Fig. I. Fig.III is a top or plan View of my arch with certain of the tiles brokenout to expose the supporting member extending therethrough.

In the accompanying drawings: A designates a fragment ofa front wall ofa furnace and B a portion of the mechanical stoker, these parts beingshown in dotted outline merely for the purpose of indicating thelocation of my ignition arch.

The ignition arch is sustained above the grate in the furnace, such asthat ordinarily supplied in mechanical stokers, the means of supportbeing two pairs'of cross beams 1 that extend transversely of thefurnace. The pairs of cross beams are separated sufliciently to providefor each pair of beams serving to perform its arch supporting functionin the proper manner according to the length of the ignition archlongitudinally of the furnace and the beams in each pair are preferablyheld in close assemblage by. clips 2 embracing the-top and bottom edgesof the beams. The beams in each air are separated from each other to asu cient degree to permit of the presence between them. of suspensionbars 3 that extend above the top are separated by vertical linesoccupied by the cross beams 1 keys 4 extending transversely through thesuspension bars and resting upon the top edges of the beams. The hangerbars 3 have legs extending considerably beneath the cross beams or mainsupports 1, and these legs are apertured.

5 desi nates heat radiating blocks made of fire c ay, or other suitablematerial, such as that ordinarily entering into the heat radiatingblocks of ignition arches. These blocks are perforated intermediate oftheir top and bottom ends, and they are arranged in rows extendinglongitudinally of the furnace and transversely of the cross beams ormain supports 1.

6 are hanger rods by which the heat radiating blocks 5 in the variousrows of blocks extending longitudinally of the furnace are supported.These rodsare mounted inthe legs of the suspension bars 3 by the simpleact of passing them through the perforations in such legs and the heatradiating blocks are threaded onto the hanger rods so that they occupypositions beneath and between the vertical lines occupied by the crossbeams or main supporting beams 1 and positioned in front of and at therear of said beams.

It will be appreciated that an ignition arch made as herein describedmay be very quickly mounted, due to its simplicity, inasmuch as the onlylabor involved after the main supporting. beams have been put in placeis that incidentto the proper mounting of the suspension bars 3 so thatthey will be supported by the cross beams 1, the disposition of thehanger rods 6 in the sus-. pension bars and the threading of the heatradiating blocks onto said hanger rods. In this connection, it isobvious that the hanger rods may be threaded through the suspension barsby degrees whenthe heat radiating blocks that are to be present betweenthe are being put in place, and that the other blocks may be readilymounted on the hanger rods when said rods are in the normal positionsthey are to occupy during the use of the ignition arch. This beingunderstood, it will be clear that when there is occasion for replacementof any of the heat radi'ating'blocks, such replacement may bevg.

effected by the simple act of withdrawing the'blocks from the hangerrods and, fwhere 11d necessary, partially withdrawing the hanger. 5

rods from thesuspension bars in order that the used blocks may bewithdrawn therefrom and new blocks substituted in their stead.

The hanger rods 6 are preferably made' suspension members dependmg fromsaid support, hanger rods mounted in said suspension members, and heatradiating blocks having perforations extending therethrough and throughwhich said hanger rods extend to support said blocks.

2. An ignition arch comprising a support, suspension members dependingfrom said support, hanger rods loosely mounted in said suspensionmembers, and heat radiating blocks having perforations extendingtherethrough and through which said hanger rods extend to support saidblocks.

3. An ignition arch comprising a support, suspension members locatedwithin said support, keys extending through said suspension members andresting on said support, hanger rods mounted in said suspension members,and heat, radiating blocks having perforations extending therethroughand through which said hanger rods extend to support said blocks.

4. An ignition arch comprising a pair of supporting beams, suspensionmembers located between said beams, ,keys extending through saidsuspension members and resting on said beams, hanger rods mounted insaid suspension members, and heat radiating blocks having perforationsextending therethrough and through which said hanger rods extend tosupport said blocks.

5. An ignition arch comprising a support, suspension members suspendedfrom said support, tubular hanger rods mounted on said suspensionmembers, and heat radiating blocks having perforations extendingtherethrough and through which said hanger rods extend to support saidblocks.

WILLIAM MILLEN DUNCAN.

In the presence of A. B. STU'ITON, G. Dr DUNCAN.

